Abrasive spool



Nov. 1, 1955 w. c. MEINERDING 2,722,092

ABRASIVE SPOOL Filed Dec. 16, 1952 9 INVENTOR.

- Wesley GMeinerding' ATTORNEYS United States Patent ABRASIVE SPOOL Wesley C. Meinerding, Canton, Ohio Application December 16, 1952, Serial No. 326,267

2 Claims. (Cl. 51-190) The invention relates to abrasive devices and more particularly to a spool or roll formed of abrasive sheet material.

It is an object of the invention to provide an abrasive spool adapted for use in polishing depression or cavities in a workpiece.

Another object is to provide such a device formed from a sheet of abrasive material rolled upon a metal core.

A further object is to provide an abrasive spool of the character referred to in which the metal core is longitudinally slotted to receive the inner end of the abrasive sheet.

A still further object is to provide such an abrasive device in which the metal core is in the form of a cotter pln.

Another object is to provide an abrasive spool in which the roll of abrasive sheet material extends beyond the outer end of the metal core.

A further object of the invention is to provide a split collet for clamping one end of the abrasive spool.

The above objects together with others which will be apparent from the drawing and following description, or which may be later referred to, may be attained by constructing the improved abrasive tool in the manner hereinafter described in detail and illustrated in the accompanying drawing, in which:

Fig. 1 is a rear elevation of a piece of emory cloth or similar sheet abrasive material adapted for forming an abrasive spool;

Fig. 2 an edge elevation of the piece of emory cloth;

Fig. 3 an elevation of an ordinary cotter pin adapted to be used as a core for the abrasive spool;

Fig. 4 an end view of the cotter pin;

Fig. 5 a view showing the manner in which one edge of the abrasive sheet is inserted into the slot of the cotter pin preparatory to rolling it upon the cotter pin;

Fig. 6 an edge view of the parts shown in Fig. 5;

Fig. 7 a perspective view of an abrasive spool formed in accordance with the invention;

Fig. 8 an elevation of the abrasive spool mounted in a collet for use;

Fig. 9 a perspective view of a modified form of metal core;

Fig. 10 an edge view showing the manner of inserting one edge of the abrasive sheet into the slot of the modified core; and,

Fig. 11 a similar view showing the metal core compressed to retain the edge of the abrasive sheet in the slot.

Referring first to the form of the invention illustrated in Figs. 1 to 7, in which similar numerals refer to similar parts throughout, the abrasive spool to which the invention pertains may be formed from a piece of abrasive sheet material, such as emory cloth or the like, as indicated at 15, and a cotter pin, as indicated at 16.

The cotter pin indicated at 16 is formed from a straight wire bent upon itself at a point intermediate its ends forming an eye 21 at the bend with two straight, parallel 2,722,092 Patented Nov. 1, 1955 legs extending from said eye in juxtaposition to each other anddefining a narrow slot 20 therebetween.

The piece of abrasive sheet material is cut to a width preferably slightly greater than the length of the cotter pin and to any suitable length depending upon the diameter of the spool desired to be made. One end of the sheet is preferably cut on the bias, as indicated at 17.

Any suitable cement or adhesive material, as indicated at 18, is applied to the back or uncoated surface of the abrasive sheet 15, as indicated in Fig. 5, and the lower, straight edge 19 of the sheet is inserted through the slot 20 in the cotter pin 16, as indicated in Figs. 5 and 6.

As best shown in Fig. 5, it will be seen that the eye or loop 21 of the cotter pin extends beyond the adjacent edge of the abrasive sheet, while the opposite end of the cotter pin terminates at a point spaced from the opposite edge of the sheet.

The abrasive sheet material, thus coated with adhesive, is then tightly rolled into a spool or roll upon the cotter pin producing the abrasive spool as indicated at 22 in Fig. 7, the biased outer end of the abrasive sheet being spirally located around the periphery of the abrasive spool as shown in Figs. 7 and 8.

The outer end of the roll or spool of abrasive material extends a short distance beyond the end of the cotter pin and the abrsive spool may be of smaller or larger diameter than shown in Fig. 7, depending upon the particular purpose for which it is to be used, and for this purpose the abrasive strip may be of less or greater length.

than shown in Figs. 1 and 5.

The device is adapted for polishing cavities or recesses in a workpiece and for this purpose the end of the spool, through which the eye 21 of the cotter pin extends, may be attached to any suitable rotating tool for rapidly rotating the abrasive spool, the other end of which is inserted into the cavity or recess of the workpiece to be polished.

For the purpose of easily and conveniently mounting the abrasive spool for use, a split collet, such as indicated generally at 23 in Fig. 8, may be provided, having the spring jaws 24 between which the eye 21 of the cotter pin and adjacent end portion of the spool may be inserted and clamped by means of the knurled nut 25 which may be tightened upon the left-hand threads 26 of the collet. The shank 27 of the collet may be clamped in the chuck of any suitable rotary tool.

In Figs. 9 to 11 is shown a slightly modified form of metal core which may be used instead of the cotter pin shown in Figs. 1 to 8. This core may comprise a suitable length of split tubing 28 having the longitudinal slot 29 therein, into which the edge of the abrasive sheet 15 may be inserted, as shown in Fig. 10.

The tubing is then pressed or squeezed together upon the edge portion of the abrasive sheet, clamping the same within the slot 29, as shown in Fig. 11, after which adhesive may be applied to the uncoated surface of the abrasive sheet as above described and the sheet is rolled upon the metal core.

It should be understood that in this form of the device the metal core, as in Figs. 1 to 7, may extend to a point spaced from the outer end of the abrasive roll, as above described.

In the foregoing description, certain terms have been used for brevity, clearness and understanding, but no unnecessary limitations are to be implied therefrom beyond the requirements of the prior art, because such words are used for descriptive purposes herein and are intended to be broadly construed.

Moreover, the embodiments of the improved construction illustrated and described herein are by way of example, and the scope of the present invention is not limited to the exact details of construction.

Having now described the invention or discovery, the

construction, the operation, and use of preferred embodiments thereof, and the advantageous new and useful results obtained thereby; the new and useful constructions, and reasonable mechanical equivalents thereof obvious to those skilled in the art, are set forth in the appended claims.

I claim:

1. An abrasive spool comprising a wire member bent upon itself at a point intermediate its ends forming an eye at said bend and two straight parallel legs extending from said eye in juxtaposition to each other and providing a narrow slot therebetween, a strip of abrasive coated sheet material having one end inserted into said slot and rolled upon the straight legs of said wire core member, the other edge of said strip of abrasive coated material being out on the bias, and adhesive means binding the abrasive coated sheet material in a tight roll of considerably greater length than diameter, said eye protruding from one end of said roll.

2. An abrasive spool comprising a wire member bent upon itself at a point intermediate its ends forming an eye at said bend and two straight parallel legs extending from said eye in juxtaposition to each other and providing a narrow slot therebetween, a strip of abrasive coated sheet material having one end inserted into said slot and rolled upon the straight legs of said wire core member, the other edge of said strip of abrasive coated material being cut on the bias, and adhesive means binding the abrasive coated sheet material in a tight roll of considerably greater length than diameter extending from said eye to a point beyond the ends of said legs, said eye protruding from the adjacent end of the roll.

References Cited in the file of this patent UNITED STATES PATENTS 240,829 Kimball May 31, 1881 394,406 Seeger Dec. 11, 1888 944,431 Hayward Dec. 28, 1909 1,119,760 Koontz Dec. 1, 1914 1,120,023 Cangen Dec. 8, 1914 1,319,417 Pollock Oct. 21, 1919 1,852,885 Keyer Apr. 5, 1932 1,952,385 Morlock Mar. 27, 1934 2,290,098 Field July 14, 1942 2,458,362 Field Jan. 4, 1949 FOREIGN PATENTS 120,793 Australia Jan. 24, 1946 

